After the HVAC is roughed in, insulation is the last step before drywall
The foundation walls are insulated from the inside with rigid XPS foam, and the dirt floor in the crawlspaces is sealed against moisture infiltration with a heavy vinyl vapor barrier.
A forced-air heat pump provides both heating and cooling for the house. Located in the salvaged portion of the original full basement, the fan coil unit is fitted with insulated ducts that prevent condensation and increase system efficiency in both heating and cooling season by reducing heat transfer .
Fiberglass was used to insulate walls, including interior partitions, where it will provide some sound-deadening between rooms . Rafter bays are fitted with baffles that keep the R-42 fiberglass batts away from the sheathing, allowing ventilating air to travel between the soffits and the ridge vents.
The final step in buttoning up was to insulate and seal the crawlspaces. After rigid XPS foam was installed on the inside of the foundation walls, a heavy vinyl vapor barrier was laid over the dirt floors and sealed to the foam [main photo]. While this work would have been easier to completed earlier in the construction calendar, it was postponed to prevent damage from plumbing, HVAC, and electrical subtrades that would need to work in the crawlspaces. (For more information on how to retrofit a vapor barrier to seal a crawlspace see “How to Install a Vapor Barrier in a Sealed Crawlspace.”)
The fan coil unit is located in the preserved section of the original full basement [1A]. Insulated trunk ducts prevent condensation and improve system efficiency by reducing heat transfer in both heating and cooling season.
Fiberglass insulation was used in all interior partitions [2A], including the laundry room [2B], where it will reduce sound transmission between rooms.